INVESTIGATION ON SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS OF TiAl INTERMETALLIC COMPOUND

The self-propagating high-temperature syn-thesis method was used to synthesize the TiAl intermetalliccompound,and two kinds of synthesis modes were studied inthis paper.The results show that the thermal explosion modeis suitable for the synthesis of TiAI,the pre-heating tempera-ture has a great influence on the synthesis.Microstructurestudy show that the density of the sample fabricated by thermal explosion mode is higher than that fabricated by propa-gating mode.     

部分MAX相在NaOH、H2SO4和HCl中的电化学性质

用热压的方法合成了若干MAX相化合物,包括相（Ti₂AlC和Ti₂AlN）和312相（Ti₃SiC₂和Ti3AlC2）;研究了它们在1 mol/L HCl、1 mol/L NaOH和1 mol/L H₂SO₄中的电化学性质及其结构与其稳定性的关系.结果表明:在所有溶液中,312型MAX相比211相更稳定;Ti₃SiC₂ 和Ti₃AlC₂几乎在所有溶液里都发生钝化,而Ti₂AlC和Ti₂AlN在1 mol/L HCl中活跃地溶解,还伴有大量气泡产生;Ti₃SiC₂比Ti₂AlC、Ti₂AlN 和Ti₃AlC₂更稳定.